//=============================================================================
// System  : MatchKit
// File    : PatternAttribute.cs
// Author  : Fabio Bussu  (matchkit@fabiobussu.it)
// Updated : 04/16/2013
// Note    : Copyright 2013, Fabio Bussu, All rights reserved
//
// This code is published under the Microsoft Public License (Ms-PL). A copy
// of the license should be distributed with the code.  It can also be found
// at the project website: http://matchkit.codeplex.com. This notice, the
// author's name, and all copyright notices must remain intact in all
// applications, documentation, and source files.
//
// Version     Date     Who  Comments
// ============================================================================
// 1.0.0.0  04/16/2013   FB  First draft
//=============================================================================
using System;
using System.Reflection;

#pragma warning disable 1591
#pragma warning disable 1573

namespace MatchKit.ObjectMapping.Attributes
{
	/// <summary>
	/// Indicates which pattern to use to match a member.
	/// </summary>
	/// <conceptualLink target="0a06b2a9-5f58-409a-ba62-639cfd77bca7" />
	[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, Inherited = true, AllowMultiple = true)]
	public sealed class PatternAttribute : PatternBaseAttribute
	{
		/// <summary>
		/// Gets the pattern to use.
		/// </summary>
		public Type PatternType { get; private set; }

		private ConstructorInfo _ctor;

		/// <summary>
		/// Initializes a new instance of the <see cref="T:MatchKit.ObjectMappping.Attributes.PatternAttribute"/> class. 
		/// </summary>
		/// <param name="patternType">Type of the pattern to allocate.</param>
		public PatternAttribute(Type patternType)
			: this(0, patternType)
		{

		}

		/// <summary>
		/// Initializes a new instance of the <see cref="T:MatchKit.ObjectMappping.Attributes.PatternAttribute"/> class. 
		/// </summary>
		/// <param name="patternType">Type of the pattern to allocate.</param>
		/// <inheritdoc cref="M:MatchKit.ObjectMapping.Attributes.PatternBaseAttribute.#ctor(System.Int32)" select="remarks|example|param" />
		public PatternAttribute(int position, Type patternType)
			: base(position)
		{
			if (patternType == null)
				throw new ArgumentNullException("patternType", "patternType cannot be null");
			if (!typeof(IPattern).IsAssignableFrom(patternType)
				|| !ReflectionUtils.IsAllocable(patternType))
				throw new ArgumentException("patternType must be a valid allocable IPattern-inherited", "patternType");
			PatternType = patternType;
			_ctor = Utils.GetDefaultConstructor(PatternType);
		}

		/// <inheritdoc />
		public override IPattern CreatePattern(object memberValue, bool isArray)
		{
			if (memberValue != null && memberValue is IPattern)
				return (IPattern)(memberValue ?? _ctor.Invoke(null));
			else
				return (IPattern)_ctor.Invoke(null);
		}
	}
}
